class MyThread extends Thread{
    @Override
    public void run(){
       while(true){
           System.out.println("hello thread");
           try {
               Thread.sleep(1000);
           } catch (InterruptedException e) {
               e.printStackTrace();
           }
       }
    }
}

public class Demo1 {
    public static void main(String[] args) {
        Thread t=new MyThread();
        //真正在系统中创建一个线程
        t.start();
        while(true){
            System.out.println("hello main");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}
